Observation of the non-linear Meissner effect

Wilcox, J. A.; Grant, M. J.; Malone, L.; Putzke, C.; Kaczorowski, D.; Wolf, T.; Hardy, F.; Meingast, C.; Analytis, J. G.; Chu, J. -H.; Fisher, I. R.; Carrington, A.

doi:10.1038/s41467-022-28790-y

Title: Observation of the non-linear Meissner effect

Journal Article · 07 March 2022 · Nature Communications

DOI: https://doi.org/10.1038/s41467-022-28790-y · OSTI ID:1866806

Wilcox, J. A. ^[1];

^[1]; Malone, L. ^[1];

^[2];

^[3]; Wolf, T. ^[4]; Hardy, F. ^[4]; Meingast, C. ^[4];

^[5];

^[6];

^[7];

^[1]

Univ. of Bristol (United Kingdom)
Univ. of Bristol (United Kingdom); Ecole Polytechnique Federale Lausanne (Switzerland)
Polish Academy of Sciences (PAS), Krakow (Poland)
Karlsruhe Inst. of Technology (KIT) (Germany)
Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Univ. of California, Berkeley, CA (United States)
Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Univ. of Washington, Seattle, WA (United States)
Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)

A long-standing theoretical prediction is that in clean, nodal unconventional superconductors the magnetic penetration depth λ, at zero temperature, varies linearly with magnetic field. This non-linear Meissner effect is an equally important manifestation of the nodal state as the well studied linear-in-T dependence of λ, but has never been convincingly experimentally observed. Here we present measurements of the nodal superconductors CeCoIn₅ and LaFePO which clearly show this non-linear Meissner effect. We further show how the effect of a small dc magnetic field on λ(T) can be used to distinguish gap nodes from non-nodal deep gap minima. Our measurements of KFe₂As₂ suggest that this material has such a non-nodal state.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); EPSRC

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1866806

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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